those are some of the concerns, he's not going to be tough enough on israel or iran and those are concerns that mccain and others have on the republican side of the senate. >> it's going to be very interesting. i think that especially will be an interesting prism to watch this all through. dana bash takes a look exactly at that issue. >> reporter: at a new hampshire town hall meeting in 2000, a voter asked then gop presidential candidate john mccain who he would put in his cabinet. listen to his answer. >> as far as secretary of defense is concerned, there's a lot of people that could do that. one of them i think is senator chuck hagel. >> reporter: that's right, mccain volunteered that he would consider chuck hagel for defense secretary. the same man he now criticizes 13 years later for the same post in president obama's administration. >> my biggest concern is his overall attitude about the united states, our role in the world, particularly in the middle east. >> reporter: what happened? to understand the depth of their fallout is to understand how close their friendship once was. beginn